[FFmpeg-devel] [PATCH 1/2] avcodec/pixlet: fixes integer overflow in read_highpass()

[Michael Niedermayer]

Fixes: runtime error: negation of -2147483648 cannot be represented in type 'int32_t' (aka 'int'); cast to an unsigned type to negate this value to itself
Fixes: 2879/clusterfuzz-testcase-minimized-6317542639403008

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/pixlet.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/pixlet.c b/libavcodec/pixlet.c
index a9661d3ab6..088226bdda 100644
--- a/libavcodec/pixlet.c
+++ b/libavcodec/pixlet.c
@@ -331,6 +331,9 @@ static int read_highpass(AVCodecContext *avctx, uint8_t *ptr, int plane, AVFrame
             return AVERROR_INVALIDDATA;
         }
 
+        if (a == INT32_MIN)
+            return AVERROR_INVALIDDATA;
+
         ret = read_high_coeffs(avctx, ptr + bytestream2_tell(&ctx->gb), dest, size,
                                c, (b >= FFABS(a)) ? b : a, d,
                                ctx->band[plane][i + 1].width, stride);
-- 
2.14.1